I have tried to move one blueprint in the library on the other one but they do not merge in the new book but only shift positions.
Is there any other obscure way to do it? Maybe console command that is not disabling achievements, because I have tried "/c game.player.insert{name="blueprint-book"}", but it disables achievements

Additionally blueprint updater is available in the hotbar while blueprint book and empty blueprint are not therefore the only way to create a new blueprint is to use copy function. This is small issue in comparison to not being able to create blueprint books

Windows 10, 64bit, Steam version